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1999 Dodge Dakota Didn't pass smog

Tiny
RLVB
  • MEMBER
  • 1999 DODGE DAKOTA
1999 Dodge Dakota 6 cyl Automatic 176618 miles

My NO reading was too high at 15mph and close to too high at 25mph( 15mph max 512 reading 971, 25mph max 765 reading 760). This truck has been very well taken care of. Within the last 5,000 miles it has a completely new exhaust system, including both O2 sensors, a new EVAP system as well as the PCM. I appreciate some help on what to do next.

Thanks.
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Monday, June 29th, 2009 AT 3:41 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
For a start clean out the EGR valve make sure its opening and closing properly and check the knock sensor
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Monday, June 29th, 2009 AT 3:47 PM
Tiny
RLVB
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I have checked both manuals I have for my V6 3.9L 1999 Dodge Dakota Pick up and I do not have an EGR Valve and I can't find any information regarding a knock sensor. Are there any other suggestions?

Thanks,

RLVB
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Monday, June 29th, 2009 AT 7:12 PM
Tiny
RASMATAZ
  • MECHANIC
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Justr checked my reference Mit1 . Com it doesn't have the EGR and KS-check the following below

Carbon buildup on pistons and in combustion chamber;

Over-advanced ignition timing;

Defective knock sensor;

Engine overheating (check thermostat, fan, coolant level);

Exhaust restrictions.
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Monday, June 29th, 2009 AT 10:09 PM

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